SST Ion: The New SST Deployment Engine (Pulumi + Terraform)

SST Ion is the open-source deployment engine introduced in SST v3, replacing AWS CDK and CloudFormation with Pulumi and Terraform providers. It delivers faster parallel deployments, eliminates CloudFormation's 500-resource stack limit, provides better error messages, and enables multi-cloud deployments (AWS, Cloudflare, GitHub, etc.) from a single TypeScript config. The post covers how Ion works, a side-by-side comparison with SST v2, a code example deploying a full-stack Next.js app, and a step-by-step migration guide from v2 to v3.